Two stage valve



Feb. 26, 1963 Filed Aug. 12, 1958 c. FARRELL ETAL TWO STAGE VALVE 4 Sheets-Sheet 1 INVENTORS .BY Jn/4%, M 7l- M ATTORNEYS Feb. ze, 1963 1ri .1=ARRE| L ETA.. 3,078,875

TWO STAGE VALVE Filed Aug. 12, 1958 4 sheets-sneer 2A ATTORNEY Feb. 26, 1963 1'. c. FARRELL ETAL 3,078,875

g Two STAGE VALVE Filed Aug. 12, 1958 4 Sheets-Sheet 3 F17. f7 BY IJ Zag; A25

ATTORNEYS Feb. 26, 1963 T. c. FARRl-:LL ETAL 3,078,875

TWO STAGE VALVE Filed Aug. l2, 1958 4 Sheets-Sheet 4 INVENTORS /OMAS fla/PREM. Hon/ARD f. fTrE/V/ousf F BY JM, 720m -f M 'z 'Z4 ATTORNEY United States Patent Utilice 3,078,875 Patented F eb. 26, 1963 3,678,875 TWO STAGE VALVE Thomas C. Farrell, Glenshaw, Pa., and Howard E. Rittenhouse, Statesboro, Ga., assignors to Rockwell Mannfactnring Company, Pittsburgh, Pa., a corporation of Pennsylvania Filed Aug. 12, 1958, Ser. No. 754,61 Claims. (Cl. 13H-639.15)

This invention relates to two stage valves and par ticularly to quantity control valves having a two-stage coaxial closure useful in predetermining ilow operations.

Two stage quantity control valves are known in the prior art. However, there is a continuing demand in the valve industry and from users of valves for improved simple, inexpensive, and reliable construction in this type of valve. At the same time it is desired to have versatility in the installation of such valves.

The present improved valve invention has been developed with such factors in mind and provides an inexpensive basic construction in which, among other things the pilot, or auxiliary stage, valve operating stem is utilized as a guide for the main valve member, a single sealing seat disk is utilized as the common seat for both the pilot and the main valve, and an auxiliary back pressure valve can be provided with simple guide means cooperating with the main valve guide stem. Three cast parts, together with other components which can be made inexpensively with conventional machine tools, provide a simplicity of construction enabling inexpensive production and maintenance. The cast structures, in one of the hereinafter described embodiments, enables convenient installation positions to be obtained merely by shifting the positions of a valve cover member and/ or a body casting without requiring readjustment of operating components. The inter-relationship of components parts provides a compact overall unit of a plural stage valve and a back pressure valve, all valve closures being coaxial.

Accordingly a principal objective of this invention resides in the provision of a novel two stage quantity control valve of inexpensive construction.

A further object oi this invention resides in providing a novel compact two stage control valve having coaxial valve control members for both valve heads and utilizing a sealing seat disk to provide a common seat for both valve stages.

Another object of this invention resides in the provision of a novel two stage control valve in which the operating stem of a first stage closure member serves as a guide post for a main valve sleeve guide. In connection with this object still another object resides in providing a novel plate type back pressure valve seated on the opposite side of the valve control port and guided for coaxial reciprocation on the main valve guide sleeve.

A still further object resides in providing a novel two stage quantity control valve with a main body casting including an axial inlet, a ported wall transverse to the axial inlet and a radical outlet; a two stage valve assembly reciprocably mounted in the main body casting with a main stage seated on the wall over the port; a casing cover assembly including operating controls, adapted to be mounted on the main body casting in a plurality of positions in which the controls cooperate with the two stage valve assembly in operative relationship, and the main body casting being adaptable for a plurality of mounting positions on an inlet coupling whereby the radial outlet and/or control members can be disposed as desired.

Still another object resides in providing a novel multiple valve closure assembly which includes a main valve guide sleeve, a composition valve seating disk, and a cast retainer ring maintaining the disk on the main valve sleeve with an outer peripheral portion of the seating disk serving as a seat for one stage of closure and the inner peripheral opposite side portion of the seating disk serving as a seat for a second stage closure.

Further novel features and objects of this invention will become apparent from the following detailed description, discussion and the appended claims taken in conjunction with the accompanying drawings showing preferred structures and embodiments, in which:

FIGURE l is a sectioned side elevation illustrating an exemplary embodiment of a valve assembly constructed in accord with the present invention;

FIGURE 2 is a partially sectioned top plan view of the valve assembly shown in FIGURE 1 illustrating the construction and assembly of the operating control arm;

FIGURE 3 is a section View taken on line 3-3 of FIGURE 2 illustrating the ange mounting holes and cover mounting holes in the valve body;

FIGURE 4 is a detail partially broken away, section view taken on line 4--4 of FIGURE l illustrating main valve head details;

FIGURE 5 is a partially sectioned side elevation view of a second valve assembly embodiment in accord with the concepts of this invention and in which the valve body inlet and outlet are disposed in alignment;

FIGURE 6 is a top plan view of FIGURE 5 valve assembly with aligned inlet and outlet utilizing the same cover and control assembly as shown in FIGURE 2;

FIGURE 7 is an enlarged detailed section elevation showing both stages of valve closure, the valve control assembly and the coaxial back pressure valve; and

FIGURES 8 through 14 are diagrammatic illustrations showing some of the valve outlet and control lever positions obtainable by means of a simple repositioning of the cover and/or main body components.

Referring now to the drawing figures for a detailed description of the invention, it will be noted that the primary distinction between the two embodiments (FIG- URES l and 5) is in the main body component of each valve assembly, the actual valving components in each embodiment being essentially the same except for some details which will be hereinafter described. Accordingly, where appropriate, similar reference numerals are used to identify similar elements.

FIGURES 1 and 2 illustrate a valve unit 14 with an axial inlet and a lateral (or radial) outlet. 'I'he valve unit 14 consists of a main body 15, a cover 16 and a valve assembly 17. The body 15 and cover 16 can be readily made by well known casting methods.

Shown in FIGURE 1, the main body 15 has a bottom inlet opening 1S and a side outlet opening 19 at right angles thereto. Each ot openings 18 and 19 has an integral peripheral coupling flange with bolt receiving holes at Zt) (see FIGURE 3) and 21 respectively. Intermediate the inlet and outlet openings is a transverse integral partition Wall Z2 having a main valve opening 23 which is coaxial with the inlet 18. Circumscribin-g the valve opening 23 is a short, beveled, annular rim 24 which projects axially toward the inlet 18. The beveled rim 24 provides a narrow circular seat surrounding the valve opening 23.

An integral end wall 25 of valve body 15, on the end opposite the inlet 1S, includes a center, exterior, sleevelike extension 26 with its through bore 27 concentric with the openings 13 and 23. Both ends of bore 27 are counterbored to receive guide bearings 28 and 29 (FIGURE l). Radially disposed around the extension 26 and spaced 90 apart in the body end wall 25 are four holes 30. These holes, which may be drilled or formed during casting and which may be more or less than four, are provided to assure that any of the fluid product conveyed through the valve which passes npwards along the valve stem and enters the cavity of the casing cover can drain from the cover while the valve is closed. The holes 30 allow an old product to drain from the upper cover chamber before a new product is passed -through the system to which the valve is connected.

The end wall portion of body 15 also has a threaded hole 32 in each of its four corners enabling attaching of the valve body cover 16. Referring to FIGURES 1, 2, and 6 the cover 16 is hollow and has an open lower end 34 surrounded by an integral rectangular, radially disposed ange 36 with four corner holes 33 which can be aligned with the threaded holes 32 in the main body in all four cover positions (see FIGURES 8-11). An annular gasket 37 is disposed in a groove 39 around the upper end of body 15 and is clamped between cover 16 and the body to provide a fluid tight t. In the vertical side wall of cover 16, FIGURE 2, adjacent its upper closed end, is a threaded opening 40 and in the opposite sidewall of cover 16 is a blind bore 42 concentric with threaded opening 40.

A combined handle and operating rod 44 passes through an axial bore 45 in a hex head gland bushing 46 which is threadedly disposed within the threaded cover opening 40 against a gland vgasket 47. Bushing 46 has a shallow counterbore at the inner end of its bore 45 within which is placed an O-ring seal 52. This O-ring 52 surrounds, engages and seals the operating rod 44 interiorly of the cover 16. A second annular bushing 54 is mounted on rod 44 so that its reduced diameter end face 56 will compress O-ring 52 within groove 50, when the control components are assembled.

A valve operating lever 60, FIGURES 1 and 7, having a radially projected arm 61 is non-rotatably mounted over a milled flat 62 near the inner end of the operating rod 44. As can be seen in FIGURE 2, the operating lever has an opening 64, the circular periphery of which is interrupted by a straight wall 65 corresponding to the flat 62 in the rod 44. Both the bushing 54 and the lever 60 are held against axial movement on operating rod 44 by a retainer clip 66 in an annular groove adjacent the inner end of rod 44. A reduced diameter inner end 68 of rod 44 adjacent the groove 67 is journalled in the aforedescribed blind bore 42 in the sidewall of cover 16. Disposed on rod 44, exterior of the cover 16, is a lever member 70, utilized for automatic valve control. Lever 70 is non-rotatably secured to the rod 44 adjacent bushing 46 by means of a set screw 72. The outer portion of the operating rod 44 is curved to form a hand lever and on its end is a suitable handle 74, as seen in FIGURES 1 and 2.

With specic reference to FIGURE 7, a reciprocable valve operating stem 76 is slidably received within the `spaced bearings 2S and 29 of the body end wall extension 26. Near its upper end, the stem 76 is slightly reduced in diameter to provide an annular shoulder 78. An annular spring retainer is disposed on the stem end against shoulder 78 and is retained on the reduced end of stem 76 by a spring clip 81 disposed in a groove. In compression between the retainer 80 and an annular shoulder 82 formed on body end wall 25 at the base of the extension 26, is a coil spring 84 which pushes upward on the stem carried spring retainer 80 to bia-s the valve operating stem in an upward direction.

At its lower end, the operating stem 76 has a blind axial bore 86 into which is litted the stem end 88 of a pilot or auxiliary valve element 90. A retaining pin 91, pressed into a diametrical bore 92 in the valve stern 88 and an aligned diametrical bore in operating stem 76, normal to the blind bore 86, secures pilot valve element 90 to the operating stem. The substantially cylindrical pilot valve stem `88 has an intermediate annular 4 shoulder 94, the diameter of which is essentially the same as the diameter of operating stem 76. The closure end of the pilot valve element 90 is mushroomed and suitably tlared to form a peripheral valve closure seat 96.

Both the pilot valve stem S8 and the lower end of the Valve operating stem 76 are slidably received within the axial bore 98 of a main valve guide sleeve 100. The bore 98 is interrupted by an integral intermediate annular web 102 having a coaxial circular opening 104 through which the stem 88 of the pilot valve element 90 is slidably disposed. Two sets of diametrically opposed open- -ings 106 and 108 are provided in the cylindrical wall of the main valve guide sleeve 100. Openings 106 permit insertion of the stem and pilot valve element securing pin 91 during assembly and openings 108 provide first stage tlow passages. The outer periphery of the guide sleeve 100 is interrupted near the lower end by a relatively large diameter annular ange 110 which has four equally spaced circular holes 112 on a concentric bolt circle. At the extreme lower end of the guide sleeve and adjacent the inner periphery of ange is an axially disposed annular lip 114 around the end of bore 98.

FIGURES 1, 3 and 6 illustrate a die cast annular main valve ring member 116 secured on the sleeve guide ilange 110 and having a central circular opening 118 larger than the pilot valve head 95. Four equally spaced threaded holes 120, within associated upstanding bosses 122, surround the opening 118 in ring member 116. The plane upper surface 124 of the ring member 116 has an outer peripheral lip 126.

The main valve disc 116 is secured to the ange 110 of the valve guide sleeve 100 by four screws 128, clamping a valve seat member therebetween. Valve seat member 130 can be made from substantial rigid composition gasket material, is annular and has four equally spaced holes, the diameters of which are equal to the diameter of the bosses 122 on main valve disc 116, so the seat member 130 fits over the ring member bosses 122. The inside diameter of valve seat member 130 is equal to the outside diameter of the inner peripheral lip 114 on the lower end of the main valve guide sleeve 100 and the outside diameter of valve seat member 130 is equal to the inside diameter of the outer peripheral lip 126 on main valve ring member 116. In FIGURE 4 items 122 are sleeves, four of which are used in place of the bosses 122 to adapt a sand cast disc 116 to be used at the lower end of valve guide sleeve 100. The preferred construction of ring member 116 is shown in FIGURES 1 and 7. Valve guide sleeve 100 also acts as a pilot for a spring biased back pressure valve 134. The back pressure valve 134 is a plate type valve consisting of a cylindrical guide member 136, which has an axial bore 138, and an annular valve washer which is rigidly secured on a reduced diameter end 142 of the guide member 136 by spinning the end of the guide. The back pressure valve assembly 134 is slidably mounted on the cylindrical portion of the valve guide sleeve 100, as clearly shown in FIGURE 7. The outer diameter of the valve washer 140 is larger than the diameter of the main valve opening 23 enabling the outer edge of valve washer 140 to rest on a machined ilat periphery of the valve body partition wall 22 and completely cover the opening 23. A coil spring 144 lits over the guide cylinder 136 and is cornpressed between the valve washer 140 and the end wall 25 of the main body 15 adjacent the bore 27 of extension 26. Movement of the back pressure valve 134 is not directly effected by movement of, or spring force against, the other movable components of the valve assembly 17. Fluid passing through opening 23 must be under a pressure of at least 3 p.s.i., to lift the back pressure valve 134 from the position shown in FIGURE 1.

Dispensing and measuring systems include a meter in the flow line, generally located ahead of the quantity control valve and, to assure accurate metering of the iiuid, an air eliminator unit is normally provided. To provide most eflicient operation of the air eliminator unit, the uid in the line behind the control valve should be pressurized and the aforementioned 3 p.s.i. back pressure is considered suflicient.

The aforesaid valve embodiment was conceived for use in a predetermined dispensing system to be installed on tank trucks, and in such installations the dispensing nozzle is relatively near the quantity control valve hence the need for a valve to assure proper back pressure on the meter and air eliminator. To serve this purpose, back pressure plate valve 134 is provided in a compact simple installation together with the other valving components.

In an installation of this valve embodiment in a tank truck dispensing system, the outlet pipe from the system meter (not shown) is fastened to the inlet end '18 of valve body by bolts received in the holes Ztl at the corners of the inlet flange. In predetermining installations, a rod (not shown) extends from a predetermining register latch box to the valve control arm 70 and is fastened thereto at pivot connection 71. When the handle 74 of operating rod 44 is depressed, the valve operating stern 76 will be forced downward by the extending arm 61 of the internal valve lever 60. Initial downward movement of operating stem 76 will cause only the pilot valve 90 to move downward from its seat, permitting passage of uid into the opening 23 by way of the guide sleeve bore 9S and the radial openings ldd in the wall ofthe valve guide sleeve 10i). A coil spring 146, which is compressed between the shoulder 94 of the pilot valve stem 88 and the web 102 of the main valve guide sleeve 10d, will hold the main valve closed even after pressure on both sides of the main valve equalizes until the lower end of the operating stem 76 strikes the guide sleeve web 102 and forces guide sleeve 190 down to open the main valve.

rIhe rod from the latch box will hold the valve control lever 70 against return rotation to its position in FIG- URE l under the biasing force of the spring 84. After a predetermined quantity of fluid has passed through the dispensing meter, the latch box will release the control arm 70 for a limited amount of return rotation. The spring 84 raises the valve operating stem 76 until it is no longer abutting the web 102 of the main valve guide sleeve 16). The inner spring 146 will then raise the guide sleeve 164) and close the main valve. After a few more gallons have passed through the meter, the latch box will allow lthe control arm 70 to complete its return and the operating stem 76 will be raised under bias of spring 84, resulting in closing of the pilot valve 9i) and a complete shutoff of flow through the valve.

The relative positions of the latch box control arm and the meter outlet are, of necessity, generally fixed in a tank truck installation. However, there are four different positions possible for the main valve body 10 for any given position of the control arm 7i). For example, FIG- URE 8 shows an installation with the control arm 7i) disposed toward the top of the sheet, and FIGURES 9, 10 and ll illustrate the same position of the control arm 70, but the main body has been rotated in either direction 90 or 180 from the position shown in FIGURE 8 to another position of alignment of bolt holes 3S and 32 without changing the position of the unit within a limited space such as is the case in tank truck service.

FIGURES 12, 13 and 14 illustrate three other positions of the control arm 70 which can be obtained by shifting the cover 90 in either direction or 180 from the position shown in FIGURE 8. In each of FIGURES 8, 12, 13 and 14 the valve outlet is disposed in the same direction and for each of the cover positions of FIG- URES l2, 13 and 14 there are three additional valve body positions corresponding to FIGURES 9, l0 and 1l. Thus it is seen that installation of this valve is extremely versatile and enables considerable tiexibility for use in diiferent tank truck installations.

The use of thel valving components of this invention can be applied to other services besides tank trucks'. In this respect FIGURES 5 and 6 show an embodiment which adapts the valve to other services. The main difference is in the body casting V. The cover 16, control linkage carried thereby and valve assembly 17 of this embodiment, excepting for the diiferences in the main valve disc 116 and small sleeves 1'22 as previously described, are the same as the cover, control linkage and valve assembly 17 hereinbefore fully described.

Although the back pressure valve 134 is not shown in FIGURES 5 and 6, one can be used if desired and necessary. It is omitted from FIGURES 5 and 6 because of the different conditions encountered in services other than on a tank truck. In most other services, the product may pass through many feet of piping before it reaches the dispensing point. Also, thel iluid might travel to a higher point than the location of the control valve. At any rate, the required 3 p.s.i. back pressure is normally inherently present downstream of the control valve and the back pressure valve need not be used.

Valve body casting 1541 provides aligned inlet and outlet openings 152 and 154 Vwhich for purposes of this description will be described as being in horizontally aligned disposition. A horizontal partition wall 156 is disposed midway of the top and bottom walls of the main body 150 and provides inlet and outlet chambers'. Upper body wall 153 is comparable in details to the end wall 25 of valve 14, having drain holes 311 and a central extension (not shown) with a bore 27'.

The partition wall 156 is provided with an opening 16 into which a seat ring insert 162 is disposed and sealingly retained by suitable means, such as sweating or brazing. Valve assembly 17 can be placed in position through bottom opening 164 in body 150 which is closed by a bottom cover plate 166 and sealing gasket 168.

In comparison with the previously described embodibodiment, the embodiment of FIGURES 5 and 6 is more logical for general installations. However, as previously described, where there are very definite spaced and dimensional limitations, as in tank truck installations, the iirst described embodiment is the more practical valve embodiment.

The invention may be embodied in other specic forms without departing from the spirit or essential characteristics thereof, The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicative by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letters Patent is: v i.

l. A quantity control valve comprising: a valve body having an inlet and an outlet, an apertured interior wall partition between said inlet and outlet, peripheral seat means around the partition aperture, and a boss integral with a wall of said valve body spaced from the outlet side of the partition wall having a through bore coaxial with said partition aperture; a valve operating stern reciprocably guided in and projecting through said bore; a iirst resilient biasing means between said body and said operating stem biasing said stem away from said partition; a main valve closure guide sleeve within said body having a coaxial through bore with a radially disposed exterior flange at one end, a radially disposed interior ilange intermediate its ends, and flow passage apertures in the guide sleeve wall intermediate the vsaid two flanges, the end of said sleeve opposite said exterior ilange being reciprocably guided on the end of said 0perating stem projecting into said body; a main valve retaining ring secured to said exterior ange; a pilot valve closure including a stern having one end projected into said guide sleeve, through said interior flange and fastened to said operating stem, a head on the other end larger in diameter than the sleeve bore and an intermediate fiange on said stem slidably disposed in the guide sleeve bore between said guide sleeve apertures and said interior flange; an annular -seat disc clamped between said exterior flange and said retaining ring providing both a main valve seat and a pilot valve seat; second resilient means between said pilot stem flange and said interior flange biasing said guide sleeve interior flange toward engagement with said one end of said operating stem; and control means on said valve body to reciprocate said operating stem to sequentially move said pilot valve head, said guide sleeve and said seat disc away from valve seated engagement.

2. A quantity control valve as defined in claim l, wherein a back pressure valve means is guided on said guide sleeve and means, having a low pressure biasing force, engage and urge said back pressure valve means to sealingly engage the periphery of the outlet chamber side of said aperture.

3. A quantity control valve as defined in claim 1, wherein said valve body comprises an integral member having said inlet at one end, said outlet disposed in a direction transverse to said inlet, and said partition wall aperture is essentially coaxial with said inlet.

4. A quantity control valve as defined in claim 1, wherein said valve body comprises an integral member having said inlet and outlet in aligned disposition, the axis of said partition wall aperture being substantially transverse to the axis of said aligned inlet and outlet, and an assembly opening larger than said retaining ring in the wall of the inlet side of said valve body and essentially aligned with said boss and said aperture; and a cover removably secured to said assembly opening.

5. A quality control valve as defined in claim l, wherein said control means comprises a cover member journalling an operating rod and means are secured to said Aoperating rod for engaging and reciprocating said operat ing stem against the biasing force of said first resilient means; and means securing said cover member to said valve body in any one of a plurality of positions coaxial with the axis of the valve operating stem, in each of which positions said means secured to said operating rod can engage and reciprocate said operating stem in an identical manner.

6. A quantity control valve as defined in claim 5, wherein said valve body has means at the inlet end enabling said body to be secured to a pipe conduit end lcoupling in any of a plurality of positions coaxial with the axis of said valve operating stem.

7. A quantity control valve comprising: a valve body having an inlet and an outlet, an apertured interior wall .partition between said inlet and outlet, peripheral seat means around the partition aperture, and means integral with a wall of said valve body spaced from the outlet side of the partition wall providing a through bore coaxial with isaid partition aperture; a valve operating member reciprocably guided in said through bore; a first resilient biasing means biasing said operating member away from said partition; a main valve closure guide member having as its sole guide structure, a central sleeve member with a `coaxial through bore enabling said sleeve member to be reciprocally slidably disposed on said operating member with said sleeve member projecting through said partition aperture, said guide member also being provided with a radially disposed exterior flange at one end, and apertures from the bore to the exterior of said guide member adjacent said flange; a main valve retaining ring se- -cured to said exterior flange; a pilot valve closure including a stem having one end projected into the bore of said guide member and fastened to said operating member, and a head on the other end larger in diameter than the guide member bore; said guide member being retained and solely reciprocably guided for limited movement on 1: said operating member by said pilot valve closure and said operating member; an annular seat disc clamped between said exterior flange and retaining ring providing a main valve and pilot valve seat; second resilient means between said pilot stem and said guide member biasing said guide member toward a limit position against said operating member; and control means on said valve body to reciprocate said operating member to sequentially move said pilot valve head and guide member and seat disc away from valve seating engagement whereby fluid may flow through each of said valves from the inlet to the outlet of the valve body.

8. A quantity control valve as defined in claim 7 wherein a back pressure valve means has a central member reciprocably mounted and guided on the exterior of said guide member sleeve member and means having a low pressure biasing force engage and urge said back pressure valve means to sealingly engage the periphery of the outlet chamber side of said aperture.

9. A two stage quantity control valve comprising: a main body member including an axial inlet, a radial outlet and a ported partition wall disposed transverse to said inlet intermediate said inlet and said outlet; a two stage coaxial valve head assembly, with a single reciprocable operating stem, reciprocably mounted in said main body member solely Aby said stem, and having a coaxially ported main stage seating on said partition wall over the port and an auxiliary stage seating over the port in said main stage whereby fluid from said inlet may communicate with said outlet through each of said stages; a casing cover assembly, including operating control components and a cover member mounting said operating control components; fastening means removably securing said cover member on said main body member with a portion of said control components separate from and adapted to coaxially operatively engage with said stem of said two stage coaxial valve head assembly, said fastening means enabling said cover member to be solely so secured in a plurality of positions coaxial with the two stage valve assembly in which the control components are disposed in operative relationship to said two stage valve assembly; and said main body member having coupling mounting means adjacent said inlet enabling a plurality of coupling mounted positions coaxial with said two stage valve assembly.

l0. A quantity control valve comprising: a valve body having an inlet and an outlet, an apertured partition wall between said inlet and outlet dividing the interior of said housing into inlet and outlet chambers, beveled periphery seat means disposed around the partition aperture on the inlet chamber side of said partition, and a boss integral with a wall portion of the outlet chamber side of said valve body having a bore coaxial with said partition wall aperture and containing reciprocable guide bearing means; a valve closure operating stem reciprocably guided in said bearing means with one end projected into said outlet chamber; first resilient biasing means between said body and said operating stem biasing said stem out of said body; a hollow valve closure guide sleeve with an outwardly projected radial flange at one end, an inwardly projected radial flange intermediate its ends, and flow passage apertures in the guide sleeve intermediate the said two flanges; the end of said sleeve opposite said one end being reciprocably guided on said one end of said operating stem; an apertured valve seat disc having an outer diameter larger than said partition aperture and an inner diameter approximately equal to the bore in said guide sleeve on the opposite side of said outer annular flange from said inner annular flange and disposed adjacent the inlet side of said partition wall; a main closure ring, with outer diameter at least equal to the outer diameter of said seat disc and an inner diameter greater than the inner diameter of said seat dise, rigidly secured to said outer annular tlange and clamping said seat disc on said outer annular ilange; a pilot valve closure including a stem adresse having one end projected through said inner annular flange and fastened to said operating stem, a head on the other end larger in diameter than the inner diameter of said seat disc and an intermediate flange on said stem slidably disposed in the guide sleeve bore between said guide sleeve apertures and said inner annular ilauge; second resilient means :disposed between said pilot stem flange and said inner annular ange biasing said inner annular flange and guide sleeve toward engagement with said one end of said operating stem; and control means secured on said valve body to engage and reciprocate said operating stem against the bias of said rst resilient means to sequentially rst move said pilot valve closure away from seating engagement with said seat disc and then engage and move said guide sleeve and seat disc away from seating engagement with said partition seat means.

11. A quantity control Valve as defined in claim 10, wherein the exterior of said guide sleeve is cylindrical and a plate type back pressure valve means is reciprocably guided on said guide sleeve and is biased to effectively sealingly engage between the periphery of the outlet chamber side of said aperture and said guide sleeve.

12. A quantity control valve as dened in claim 11, wherein said :back pressure valve means comprises an apertured disc with a concentric guide boss slidably tting over the cylindrical guide sleeve and a compression coil spring disposed over said guide boss and engaging the valve body to resiliently bias the check valve against the valve body partition.

13. In a quantity control valve having a main valve body comprising inlet, outlet and an intermediate ported partition wall, .a multiple valve closure assembly reciprocably mounted in said body comprising: an elongate main valve guide member smaller in cross section than the port in said partition wall, disposed so that it projects completely through said partition wall port with a large continuous radial clearance and having a through bore, a radially outwardly ldisposed annular end flange on said guide member, a substantially rigid annular valve seat, a main valve retainer ring maintaining said annular valve seat on said guide member end flange with an outer peripheral portion of said annular valve seat adapted to engage and seat against the periphery of the port in said wall to serve as one stage of closure and the inner peripheral opposite side portion of said annular valve seat providing a seat for a second stage of closure.

14. In the valve as defined in claim 13 said retainer ring includin-g an annular series of pilot bosses disposed in matched openings in said annular valve seat and fastening means connect between said end flange and said bosses to clamp said end flange, said annular valve seat and said retaining ring as a unit.

d5. Flow control valve assembly permitting two stage opening and closing of the flow area, comprising: a main valve body with inlet, outlet, and an interior partition wall disposed between said inlet and said outlet provided with a valve seat forming an aperture; a second wall spaced from said partition wall and having a boss with a bore coaxial with said partition wall aperture, a valve assembly cooperating with the valve seat of the partition wall including an operating stem being reciprocably mounted in said bore, said valve assembly further including outer and inner coaxial valve members, means directly connecting said inner valve member to said operating stem, said outer valve member having a sleeve projection with a central through bore, said sleeve solely being reciprocably mounted for sliding movement on said operating stem and said inner valve member and being Iadapted to seat on the periphery of the valve seat of said partition wall and a portion of said central bore enabling uid communication between said inlet and said outlet, said central bore being surrounded by a valve seat cooperating with said inner valve member, said outer valve member further having a radially inwardly directed ange means located intermediate the ends of said central bore, adapted to be abutted by said operating stem upon reciprocation of said operating stem, a resilient biasing means disposed between said inner valve member and said flange urging said inner valve member in an opening direction and urging said outer valve member in a closing direction, said flange being so arranged that upon movement of the operating stem in the opening direction, the outer valve member remains iirst in its closing position and is entrained and reciprocally moved by said operating stern only when the inner valve member has already opened.

References Cited in the file of this patent UNITED STATES PATENTS 844,946 Lowe Feb. 19, 1907 1,850,063 Pepper Mar. 15, 1932 2,630,137 Krone Mar. 3, 1953 2,822,000 Daniels Feb. 4, 1958 FOREIGN PATENTS 251,392 Great Britain ..1 May 6, 1926 287,719 Great Britain Mar. 29, 1928 309,335 Germany Nov. 18, '1918 409,145 Italy Feb. 5, 1945 1,053,722 France Sept. 30, 1953 UNITED STATESv PATENT OFFICE CERTIFICATE OF CORRECTION Patentl Noe 3,078,875 February 26 1963 Thomas C Farrell et al error appears in the above numbered patlt is hereby certified that tl the said Letters Patent should read as enTJ requiring correction and tha corrected below.

Signed and sealed this 22nd day of October l93 (SEAL) Attest:

EDWIN Lo REYNOLDS ERNEST w, SWIDEE Attesting Officer AC Ling Commissioner of Patents 

13. IN A QUANTITY CONTROL VALVE HAVING A MAIN VALVE BODY COMPRISING INLET, OUTLET AND AN INTERMEDIATE PORTED PARTITION WALL, A MULTIPLE VALVE CLOSURE ASSEMBLY RECIPROCABLY MOUNTED IN SAID BODY COMPRISING: AN ELONGATE MAIN VALVE GUIDE MEMBER SMALLER IN CROSS SECTION THAN THE PORT IN SAID PARTITION WALL, DISPOSED SO THAT IT PROJECTS COMPLETELY THROUGH SAID PARTITION WALL PORT WITH A LARGE CONTINUOUS RADIAL CLEARANCE AND HAVING A THROUGH BORE, A RADIALLY OUTWARDLY DISPOSED ANNULAR END FLANGE ON SAID GUIDE MEMBER, A SUBSTANTIALLY RIGID ANNULAR VALVE SEAT, A MAIN VALVE RETAINER RING MAINTAINING SAID ANNULAR VALVE SEAT ON SAID GUIDE MEMBER END FLANGE WITH AN OUTER PERIPHERAL PORTION OF SAID ANNULAR VALVE SEAT ADAPTED TO ENGAGE AND SEAT AGAINST THE PERIPHERY OF THE PORT IN SAID WALL TO SERVE AS ONE STAGE OF CLOSURE AND THE INNER PERIPH- 